Gold Electroplating Specifications Overview:

Minimum gold purity requirements given by standard;

Type 1 - 99.7% gold minimum
Type 2 - 99.0% gold minimum

Thickness class specifications requirements:

Class 0 - 30 micro-inches (.762 microns)
Class 1 - 50 micro-inches (1.25 microns)
Class 2 - 100 micro-inches (2.54 microns)
Class 3 - 200 micro-inches (5.06 microns)

Electroplating hardness grades